SSL Key Ownership
Issue: After receiving renewal notice from Let's Encrypt for Jupyter server, go to the virtual machine hosting Jupyter and renew the key successfully. But cannot login to the jupyter notebook…
MathJax Load Failed – WP Security Plugin
Issue After installing a WordPress security plugin call All-In-One WP Security, MathJax failed to load some JS including. Solution In the setting of the plugin, choose the tab Additional Firewall…
Centos7 Virtualmin Upgrade PHP7 MariaDB
This is my first blog after upgrading to WordPress 5.1 from ver.4.8. Yes, I never tried 5.0 as it's always risky to have a major upgrade to ver. x.0. The…
WordPress Duplicator Plugin Server Error 500
Issue: During scanning stage of running the Duplicator plugin on a WordPress site, there was an error: Server Error 500. Solution: Modify /etc/php.ini file to increase memory: memory_limit = 256M…
WP Fastest Cache Plugins Update Issue
Issue: After installing WP Fastest Cache plugin, whenever update any plugin, there is error - Update failed. Could not remove old plugin. Solution: Go to WPFC at the top bar…
Scrolling to Section ID Missing
Issue: When moving some of the content to a single page design, the menu link will be addressing the div id instead of another page. But after all set up…
WooCommerce Showing Unmatched Variations
Issue: error: "Sorry, no products matched your selection. Please choose a different combination." WooCommerce in WordPress shows all variations of variable product including unmatched variations thus the above error message may…
WordPress Custom CSS Disappear
Background: It is quite terrifying if suddenly all the custom CSS disappear and you do not have a backup of the text of the custom CSS that is not just one or…
MathJax Incompatibility to LaTex
Issue: "Error: Missing argument to \begin" when using \color command and together with \boxed command in WordPress with MathJax plugin as if they are under LaTex syntax. Solution: Adding {}…
iMac View Camera Capability
Issue: While conducting Online Live Class using Join.Me, and I need to select real-time video as profile. However, it seems that the built-in view camera in iMac cannot make any adjustment.…